where the gain \(K_{I,2} \in \mathbb {R}\)  is set equal to 1. A classic anti-windup setting (see, e.g., [1]}) is mandatory. The critical occupancy rate \(To^\ast _4\)  corresponds to the critical density \(\rho _c\)  in Formula (REF ). A “good” real-time calibration of \(To^\ast _4\)  seems today out of reach. We therefore set as in [2]}
\({\left\lbrace \begin{array}{ll}To^\ast _4(t+1)=To^\ast _4(t)+\delta ^+\text{ if }V_4 >V_{4, \text{threshold}}\\To^\ast _4(t+1)=To^\ast _4(t)-\delta ^- \text{ if not}\end{array}\right.}\) 
